So here we are...you have been loving your Moon Sport XP400 or XP780 for a crazy long time. Now the battery needs to be replaced so you can keep on getting that Moon Sport performance you're accustomed to. Since conventional batteries keep lights of this power going for about 20-30 hours on a set, it might be a good time to calculate all the dough you've saved too. In the meantime, Nashbar is the place to order your replacement battery, moneybags.